Question

What is the solution of the following system?
3x+3y=10
-9x-9y=-30

Answer 1

well multiply every term in the 1st equation by -3, what do you get...?

Answer 2

-9-9=-30

Answer 3

sorry forgot the x and y
-9x-9y=-30

Answer 4

@campbell_st

Answer 5

yep... so what can you say about the 2 equations...?

Answer 6

They are now the same

Answer 7

therefore, it has infinity solution's.

Answer 8

if 1 line is a multiply of the other, you are dealing with the same line... so as @RadEn say..there are an infinite number of solutions... every point on the 1st line is also on the 2nd line.

hope this helps